C Reference function difftime()

Usage of difftime():

double difftime ( time_t time2, time_t time1 );

Parameters:

Time1 and time2 are both time_t objects.

Return Value:

The difference in seconds between time2-time1 will be returned as a floating point double.

Explanation:

Calculates the difference in seconds between time1 and time2.

Source code example of difftime():



#include <stdio.h>
#include <time.h>

int main ()
{
	time_t time1,time2;
	char get_input [256];
	double dif_sec;

	time (&time1);
	printf ("Please enter the name of your pet: ");
	gets (get_input);

	time (&time2);
	dif_sec = difftime (time2,time1);
	printf ("It took you %.2lf seconds to type the name.\n", dif_sec );

	return 0;
}

Output example of the program above:



	Please enter the name of your pet: wodan

	It took you 2.00 seconds to type the name.

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Lutz Pansegrau on September 30th, 2011:

Thanks for the example.

Some C programmer struggling to produce a simple time delay (in seconds).

Here my example:

#include

void delay(int sec); /* Function declaration */

int main()
{
….
delay (3) /* sec = 3 seconds delay */
….

return 0;
}

/* Time delay function definition */

void delay(int s)
{
time_t time1,time2; /* declare timer */

time (&time1); /* initialize both timer */
time (&time2);

while (difftime (time2,time1) <= s) /* Loop until time difference is equal to s seconds */
time (&time2);

}

Regards

Lutz Pansegrau